Hello again Hayan,
It's awesome that you have customers near and far that use different currencies! I hope that means business is doing well for you. :)
QuickBooks Self-Employed currently handles Canadian currency transactions. I can appreciate the desire for a multi-currency system, but that's not something that's available at this time. I encourage you to submit feedback about this by heading to the Assistant feature, then typing "Feedback," hitting send/enter, then following the prompts.
You can also consider QuickBooks Online if the multi-currency feature is essential to your business. The feature is available in Online's Essentials and Plus packages, and is great for ensuring these numbers are recorded accurately in your books.
I've got a few articles with more information about QuickBooks products, their features, and the options moving forward. Check them out below.
If you'd like to discuss your options for QuickBooks Self-Employed in more detail, feel free to get in touch with our dedicated team using the following options: Contact QuickBooks Self-Employed
Have a great rest of your day!